Abstract

An optical theory is developed to calculate the power transmission of a Gaussian beam through a hollow circular dielectric waveguide. This theory uses Fresnel formulas of wave reflection on a dielectric wall and approximate formulas of Gaussian beam diffraction through a circular aperture. The calculation is valid for low-loss waveguides and for beams weakly diffracted by the guide aperture. These conditions are fulfilled in most of the usual cases. The results agree well with theoretical relations derived from propagation constants of modes. An application is made to the waveguides used in the infrared interferometer for the JET tokamak.

© 1982 Optical Society of America

Gaussian beam transmission through circular waveguides with conducting wall material

J. P. Crenn
Appl. Opt. 24(21) 3648-3658 (1985)

Optical study of the EH₁₁ mode in a hollow circular oversized waveguide and Gaussian approximation of the far-field pattern

J. P. Crenn
Appl. Opt. 23(19) 3428-3433 (1984)

Changes in the characteristics of a Gaussian beam weakly diffracted by a circular aperture

P. Belland and J. P. Crenn
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Optical theory of Gaussian beam transmission through a hollow circular dielectric waveguide: errata

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Waveguides: characteristic modes of hollow rectangular dielectric waveguides

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